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[...] I worked in automation control some 15 years ago automating water dredges, but the technology moves as fast as PC technology so 15 years has been awhile to be out of the loop on new advances.the motors on the chair work well, and I know there has to be some type of speed control because I had that wired into the control box panel. If I had the manual would help a great deal.
And don't even consider mixing a lap top into the equation, that would only make it so much more complicated during daily use - what you had worked, don't reinvent the wheel (chair)
What voltage does it use?Can you follow a schematic diagram, make a PCB (if the outlay is provided) and build it up?I assume you can get to the "raw" motor supply lines, i.e. that the blown controller is something exterior to them?